Overhaul native approval UX and add widget surfaces

Bring the SwiftUI app in line with the Apple-native mock and keep pending approvals actionable from Live Activities and watch complications.

swift/Sources/Core/Services/AppStateStore.swift

@@ -1,5 +1,13 @@
 import Foundation
 
+enum SharedDefaults {
+    static let appGroupIdentifier = "group.global.idp.app"
+
+    static var userDefaults: UserDefaults {
+        UserDefaults(suiteName: appGroupIdentifier) ?? .standard
+    }
+}
+
 struct PersistedAppState: Codable, Equatable {
     let session: AuthSession
     let profile: MemberProfile
@@ -19,7 +27,7 @@ final class UserDefaultsAppStateStore: AppStateStoring {
     private let encoder = JSONEncoder()
     private let decoder = JSONDecoder()
 
-    init(defaults: UserDefaults = .standard, storageKey: String = "persisted-app-state") {
+    init(defaults: UserDefaults = SharedDefaults.userDefaults, storageKey: String = "persisted-app-state") {
         self.defaults = defaults
         self.storageKey = storageKey
     }